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A sample of 84 golfers showed that their average score on a particular golf course was 89.05 with a standard deviation of 3.47.
a) Find the 98% confidence interval of the mean score for all 84 golfers.
b) Find the 98% confidence interval of the mean score for all golfers if this is a sample of 115 golfers instead of a sample of 84.
c) Which confidence interval is smaller and why?
Stock A has an expected return of 12% and a standard deviation of 40%. Stock B has an expected return of 18% and a standard deviation of 60%. The correlation coefficient between Stocks A and B is 0.2.
Mean and standard deviation are 584.6 and 34.28
Find a 90% confidence interval for the mean decibel level µ for this type of transit vehicle.
A library checks out an average of 250 books per day, with a standard deviation of 75 books. If a sample of 36 days of operation is selected and the sample mean is computed,
Is it reasonable to conclude that this set of n = 16 people is not a representative random sample of registered voters?
Find the z-score for each score in the population. Transfer the original population into a new population of N=5 scores with a mean of μ=60 and a standard deviation of σ=8
A college believes that 28% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried to within 5 percentage points with 95% confidenc..
Using the data for women, complete an analysis of CHD incidence in women similar to the one completed for men.
Suppose you went to the Bureau of Labor Statistics web site and found several predictors of your salary. State three possible predictors and a simulated multilinear regression equation along with their p-values. What does your p-values tell you ab..
A company that has 200 employees chooses a committee of 15 to represent . When the committee is formed, none of the 56 minority employees are selected. if the committee is chosen randomly. What is the probability that it contains no minorities.
Describe the advantages and disadvantages of quasi-experiments? What is the fundamental weakness of a quasi-experimental design? Why is it a weakness? Does its weakness always matter?
Describe what the researcher must do if one of the requirements is not met and give illustrations.
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